Granted Patent
Utility
US 4,308,357 · App. 06/198,749
Block copolymerization process and product
Inventors:
Malcolm J. Kaus, Birendra K. Patnaik
Patented Case
View Patent ↗
Granted: Dec 29, 1981
Filed: Oct 20, 1980
Inventors
Malcolm J. Kaus
Birendra K. Patnaik
Assignee (at issue)
El Paso Polyolefins Company
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.